I have an issue with my current storage.img
file (btrfs). I had 2TB data inside a container and so the storage.img got 2TB large. After this I deleted everything, leaving me with 100GB of real data. The problem is now, that the storage.img did not shrink itself to 100GB. It is still 2TB big.
I have created another storage newstorage.img
(btrfs) in LXD with the command lxc storage create newstorage
but I don't know how to transfer the containers to the new storage the right way so I can delete the old storage.img
and reclaim my HDD space.
I tried things like manually mounting the two imgs and doing cp -R /one/* /new/
but then I cannot start the containers.